First find the height
(5*5)+(x*x)=(13*13) Pythagorean theorem a squared+b squared=c squared c=hypotenuse(the longest side)
25+(x*x)=169
(x*x)=144
x= square root of 144=12
height=12cm
AREA=1/2base*height
AREA=5*12=60
ANSWER A)
AREA=60 squared cm
